AutoCodes – Chevrolet – P11C7 Chevrolet

P11C7 Chevrolet Code - NOx Sensor 2 Heater Ground Circuit

Quick Answer

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. Common causes include Faulty Nitrogen Oxides (NOx) Sensor 2, Nitrogen Oxides Sensor 2 harness is open or shorted, Nitrogen Oxides Sensor 2 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P11C7 Chevrolet indicates NOx Sensor 2 Heater Ground Circuit.
Common causes: Common causes include Faulty Nitrogen Oxides (NOx) Sensor 2, Nitrogen Oxides Sensor 2 harness is open or shorted, Nitrogen Oxides Sensor 2 circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 2,383

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Mar 24, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P11C7 Chevrolet Description

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. There are two NOx sensors, one placed upstream of selective catalytic reduction, to measure inlet NOx concentration, and one placed downstream. They are connected with the control module via CAN and all the information is exchanged through it. Since it is a smart sensor, all the electrical monitoring is performed inside the sensor and only the results are sent to the Engine Control Module (ECM). Each NOx sensor contains a sensing cell, a pumping cell, and a heater. A sample of exhaust gas passes through a diffusion gap between the sensing cell and the pumping cell. The NOx sensor maintains a constant reference voltage across the sensing cell. An electronic circuit within the sensor controls the pump current through the pumping cell in order to maintain a constant voltage in the sensing cell. The amount of current required to maintain the reference voltage in the sensing cell is proportional to the concentration of NOx in the exhaust. The ECM varies the amount of diesel exhaust fluid (reductant) added by varying the reductant injector duty cycle in response to changes in engine exhaust NOx levels. The smart NOx sensors consist of two components, the NOx module and the NOx sensor element that are serviced as a unit. A circuit or performance condition with a NOx sensor is detected by the NOx sensor module. The smart NOx sensor module communicates the condition to the ECM over the serial data line. The ECM sets a DTC when a serial data message is received from the NOx sensor module. The Diagnostic Trouble Code (DTC) will be set if the ECM software detects a fault in the NOx sensor circuitry or a performance fault in the NOx sensor for greater than 2 s.

OBDII Code P11C7 Chevrolet - NOx Sensor 2 Heater Ground Circuit - AutoCodes.com — P11C7 Chevrolet Code - NOx Sensor 2 Heater Ground Circuit

What does this mean?

What are the Possible Causes of the DTC P11C7 Chevrolet?

Faulty Nitrogen Oxides (NOx) Sensor 2
Nitrogen Oxides Sensor 2 harness is open or shorted
Nitrogen Oxides Sensor 2 circuit poor electrical connection

How to Fix the DTC P11C7 Chevrolet?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P11C7 Chevrolet code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P11C7 Chevrolet code?

Need more information on how to fix the P11C7 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P11C7 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P11C7 2014 Chevrolet Silverado — NOx Sensor 2 Heater Ground Circuit
P11C7 2015 Chevrolet Silverado — NOx Sensor 2 Heater Ground Circuit
P11C7 2016 Chevrolet Silverado — NOx Sensor 2 Heater Ground Circuit
P11C7 2017 Chevrolet Silverado — NOx Sensor 2 Heater Ground Circuit
P11C7 2018 Chevrolet Silverado — NOx Sensor 2 Heater Ground Circuit

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P11C7 Chevrolet Code

1. What is the P11C7 OBDII code for a Chevrolet vehicle?

The P11C7 code specifically relates to the NOx Sensor 2 Heater Ground Circuit in Chevrolet vehicles.

2. What are common symptoms of the P11C7 OBDII code in a Chevrolet car?

Common symptoms of the P11C7 code may include the Check Engine Light illuminating on the dashboard, reduced engine performance, and potential issues with emissions.

3. What can cause the P11C7 OBDII code to trigger in a Chevrolet vehicle?

The P11C7 code is typically triggered by a malfunction in the NOx Sensor 2 Heater Ground Circuit, which may be caused by wiring issues, sensor failure, or a faulty heater element.

4. How can I diagnose the P11C7 OBDII code in my Chevrolet car?

Diagnosing the P11C7 code usually involves using an OBDII scanner to retrieve the specific fault code, followed by inspecting the wiring, sensor connections, and heater element associated with NOx Sensor 2.

5. Can I continue driving my Chevrolet vehicle with the P11C7 OBDII code?

It is not recommended to drive your Chevrolet vehicle with the P11C7 code present, as it can lead to increased emissions, reduced fuel efficiency, and potential damage to other components over time.

6. How can I repair the NOx Sensor 2 Heater Ground Circuit issue causing the P11C7 code in my Chevrolet car?

Repairing the P11C7 code typically involves fixing the wiring connections, replacing the NOx Sensor 2 if necessary, or addressing any faults in the heater element to restore proper functionality.

7. Will resetting the Check Engine Light resolve the P11C7 OBDII code in my Chevrolet vehicle?

Simply resetting the Check Engine Light may temporarily clear the code, but it will not fix the underlying issue causing the P11C7 fault. It is important to diagnose and repair the problem to prevent it from recurring.

8. Are there any DIY tips for troubleshooting the P11C7 OBDII code in a Chevrolet car?

DIY tips for troubleshooting the P11C7 code include visually inspecting the sensor connections and wiring for damage, checking the heater element for continuity, and ensuring proper electrical connections.

9. How much does it cost to repair the NOx Sensor 2 Heater Ground Circuit issue causing the P11C7 code in a Chevrolet vehicle?

The cost of repairing the P11C7 code can vary depending on the exact cause of the issue, but it may involve replacing the NOx Sensor 2, repairing wiring, or addressing any other related component failures.

10. Can a mechanic help me with diagnosing and repairing the P11C7 OBDII code in my Chevrolet car?

Yes, a qualified mechanic or automotive technician can assist in diagnosing and repairing the P11C7 code, ensuring that the NOx Sensor 2 Heater Ground Circuit issue is properly resolved.